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A New Measurement of the Proton Capture Rate on 7Be and the S17(0) Factor

L. T. Baby·C. Bordeanu·G. Goldring·M. Hass·L. Weissman·V. N. Fedoseyev·U. Koester·Y. Nir-El·G. Haquin·H. W. Gaggeler·R. Weinreich·the ISOLDE Collaboration
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Abstract

The 7Be(p,gamma)8B reaction plays a central role in the evaluation of solar neutrino fluxes. We report on a new precision measurement of the cross section of this reaction, following our previous experiment with an implanted target, a raster scanned beam and the elimination of backscattering losses. The new measurement incorporates a higher activity 7Be target and a number of improvements in design and procedure. The cross section at Ec.m. = 850 keV was measured several times under varying expermental conditions, yielding a value of S17(Ec.m.=850 keV) = 24.0 +/- 0.5 eV b. Measurements were carried out at lower energies as well. We obtain from the entire set of measurements an extrapolated value of S17(0) = 21.2 +/- 0.7 eV b.

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L. T. Baby, C. Bordeanu, G. Goldring, M. Hass, L. Weissman, V. N. Fedoseyev, U. Koester, Y. Nir-El, G. Haquin, H. W. Gaggeler, R. Weinreich, the ISOLDE Collaboration. 2003-04-04. A New Measurement of the Proton Capture Rate on 7Be and the S17(0) Factor. https://doi.org/10.1103/physrevc.67.065805%2010.1103%2Fphysrevc.69.019902

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